Lifting-jack.



II. A. WINNERS.

LIFTING JACK.

APPLICATION FILED FEB. 7, 1914. IIEIIEWEI; 1AII.29.:9I5.

Patented June 29, 1915.

2 SHEETS-SHEET l.

H. AfCONNERS.

mms JACK. l APPLICATION FILED FEB.7,1914. KEHEWED JAN.29,1915

9 ggo I Patented June' 915.

2 SHEETS-S T2.

v .jeren J7. C022 wens c@ j kfw f U70@ f @5g HERBERT A. CONNERS, OFBOSTON, MASSACHUSETTS.

LIFTING-JAGK.

Specification of Lette/rs Patent.

Patented June 29, 1915.

Application led February 7, 1914, Serial No. 817,334., Renewed January29, 1915. Serial No. 5,124.

T alli/171.01m. it may concern Be it known that I, HERBERT A. CoNNnns,

o. citizen of the United States, and resident of Boston, county ofSuffolk, Commonwealth of Massachusetts, have invented an Improvement inLifting-Jacks, of which the following description, in connection withthe. zicconipenying dreu'ings, is e specification, like characters onthe drawings representing like parts in each of the several views.

Thisinvention relates to lifting jacks, and while having other and moregeneral fields of usefulnessy is well adapted and designed for use inlifting automobile axles and siniiler work.

A prime object of the invention is to provide en inproved jack' ofrelatively compact dimensions, that is, of smell height when the plungeris run in or collapsed, while hving :it the saine time a relatively longli t.

A further object of the invention is to provide n jack With thesecharacteristics that is exceptionally simple and cheep in constructionand et the same tiiney strong and efficient in use.

A. still further object is to provide n jack this type that hasexceptionally great lifting capacity in proportion to the powerrequired, b v reason of frictionel end like re-4 f-istence beingminimized by the application of the power direct to the lift.

The above sind other objects and features ofthe invention will be betterunderstood froin the following detailed description teken in connectionwith the licconn'ninyin,ef drawings and will be thereafter pointed outin the appended claims.

. Referring to the drawings: Figure 1 is zi v front elevation of a jackconstructed in eccordance with my invention, parts being sectioned swayto better show the 'interior construction: Fig. 2 is .fi side elevationthereof with parts also sectioned away; Figjl is ar plan view, und Fig'.4 is n vertical section Inu-ijlyA broken away showingthe jack with plungers run out.

The brise of the jack is indicated :it es an upright housing which isshown its rectmiirulor nud ohlonfg in cross section. This housing hassliduhly fitted therein a har or.

block 11.. which is adapted to telescope wholly within the'housing or toloe proyec-,ted outward therefrom et will, constituting ii secondery plunsrer es presently described. Yhe.

block or sec idery plunger 11 is hollowcdout lengthwise to receivezinvinnerrectu-ngular primary plunger 12, this plunger having :i reducedfront portion 13 which extends out flush with the front of the hlork i1und interfits with retainingv iiinges 1l ut the front of the block 11.The plunger 12' has rack teeth 15 throughout the height thereof whichengage with teeth of :i long spur pinion 1G journziled et 17 in thefront of the housing near the top thereof. The pinion 1G has at one enda shaft extension 18 squared as et 19 to receive e crank or like op,ereting device, while e similar shaft exten- Sion et the other end ofthe pinion has fixed thereon :i ratchet wheel 2O with which c0- Operntcs:t puwl 21 pivoted to the housing ut 22 to prevent lnickwzird turning ofthe pinion except when. the pmvl is tripped.

lt is to he observed that the teeth 1.5 of plunger 12 extend up so thatthe upper ones thereof engage the pinion 1G when the plunger is inlowerinost position so that it may -loe run out as required nierelybyturning the pinion 16.

The front of block 11 :it the sides of the plunger is also equipped withrack' teeth 23 adapted to engage the teeth of y pinion 16. but whenthepblock is in lowerings, the topmost ones of these teeth terminatejust short of the pinion 1G so that they are not engaged thereby.

The bottom of plunger 12 is equipped with means to engage the block 11when the plunger is nearly run out, and for this purpose I show laterallugs 24 which move in grooves 25 provided therefor in the block 11,there being shoulders 26 et the ends of these grooves near the top ofthe block with which the lugs 24C engage when the plunger is nearly runout. As this occurs, the inel movement of the plunger 12 picks up theblock 11 endlifts it enough so that the. topmost ones of the teeth 23come into engagement with the teeth of pinion 16 so that the hloek isthen under control of the pinion 1G to be lifted thereby. As this occursu dop; 27 ivoted :it 2S to the top of block 1,1 is pressed into e notchv29 near the lower end of plunger 12 by n spring 30 housed in the top ofthe block, this notch having n. horizontal stop shoulder at its topwhich thus locks the plunger to the block and causes it to continue to,move upward 'with'the block :is the block is lifted. lt will he observedthat ns this occurs the plunger 12 still has some little extent ofbearing engagement `.vith the block Y11 so thatgit is securely held andsupported laterally as wellas vertically thereby. The dog 2'." has ahandle 31 extending without the housing 'so that itmay be convenientlytripped to the housing. It is to be noted that the top 83 of plunger l2is adapted to be run back entirely Within the housing so that the jackis -very compact and of relatively small height when the plunger is runin.

It is to be observed that in the use of my improved jack the applicationof power is made directly to the lifting element, both during theinitial lifting of plunger l2, and' during the lifting of the block orsecondary plunger 11 carrying with it the plunger 12,

vand that in this second lifting movement there are no additional partsthat have to be lifted, nor any additional gearing required, so that thedevice is at once exceptionally simple and particularly eflicient.

I am awarethat details of construction, such as the specific characterof the operating device can be varied without departing from the spiritof the invention and I therefore desire the present embodiment to beconsidered as illustrative and not restrictive and refer rather to theappended claims to indicate the scope of the invention.

` Having described my invention, what I claim as new and desire tosecure by Letters Patent is:

l. A lifting jack. comprising a base support, a plunger mounted for inand out movement relative thereto, an operating device connected witasaid plunger, and a slidable member normally disconnected from saidoperating device having connectionl with said plunger to be brought intooperative relation to the operating device as the vplunger nears...theouter limit of its nievement, whereby :it may be moved out from the basehyd-said operating device, there being previsioni whereby the plunger isthen locked to said member to be moved farther outward. 2. A liftingjack, comprising a base support, a primary plunger mounted for movementin and out relative thereto, an operating device for said primaryplunger, and a secondarv plunger slidablv mounted in the base and alsoin slidable relation to the primary. plunger, said secondary plungerhaving provision forvconneetion to said operating de- `vice, normally ininoperative position, in-

terengaging means on said primary plunger and secondary plunger wherebythe second- -mary and secondary plungers slidably tted in said base andalso mounted for limited sliding movement with respect to each other, anoperating device mounted on the base, means on both of said plungers forengaging -said operating device, such means on said secondary plungerbeing normally disconnected from the operating device, there beinginterengaging portions on said primary and secondary plungers, wherebythe former picks'up the latter near the limit of its eutward movementandengages it withsaid operating device for farther outward movement, and adog on one of said plungers mounted to engage a. notch on the other tolock them together when the primary plunger is extended and being movedoutward by the secondary plunger.

4. A lifting jack, comprising a base support, primary and secondaryplungers slidably mounted in said support and one mounted for limitedsliding movement relative to the other, said plungers each presenting apla-ne front face equipped with rack teeth, such teeth on the primaryplunger being extended up beyond those on the secondary plunger,` anelongated pinion mounted to engage the/teeth of the primary plunger andnormally out of engagement with the teeth of the secondary plunger,there being means whereby the primary plunger picks up the secondaryplunger near the limit of its' outward movement to bring its teeth intooperative relation to said pinion, means for then automatically lockingthe primary plunger to the secondary plunger, and means for holding saidplungers in the position to which they are run out. l

In testimony whereof, Ichave signed my `name to this specification, inthe presence of two subscribing witnesses.

HER-BERT A. CONNERS. Witnesses:

HARRY G. PAYNE, (imm: L. ROGERS.

